Author: Hristo
Date: 22:53:05 06/01/99
Go up one level in this thread
On June 01, 1999 at 20:08:41, Gregor Overney wrote:
>There are several reasons why you got a stronger 15.20. But let's look at
>"plain" search strength.
>
>Did you run 'bench' on 15.20 and 16.8 to make sure that both engines run roughly
>the same amount of nodes/second? It is possible that 15.20 has been compiled
>with /Oa and VC++ 5.0 SP3. Until SP3 of VC++ 6.0 got released, Microsoft was
>"able" to sell a broken version of /Oa. It seems to be fixed in SP3. This little
>difference makes your code run 5% faster.
>
>Gregor
bench results.
Crafty v15.20
Total nodes: 71947394
Nodes per second: 199853
NPS relative to Pentium Pro/200: 2.35
---
Crafty v16.8
Total nodes: 64819342
Raw nodes per second: 228237
SMP time-to-ply measurement: 4.115942
---
so crafty 16.8 seems faster!
This, however didn't help in the second 1 hour game.
Just forward to move 39. or before it, and then see what developed ..
I do beleive this position (before black 39th move) is even and yet
just few moves after that blacks position goes to "hell".
I do beleive 39... f5(?) is a bad mistake ... 3 out of the 5
games that 16.8 has lost so far are in somewhat similar situations ...
[Event "Computer chess game"]
[Site "KAISSA"]
[Date "1999.06.01"]
[Round "-"]
[White "wcrafty-15_20.exe"]
[Black "wcrafty-16_8.exe"]
[Result "1-0"]
[TimeControl "40/3600"]
1. d4 d5 2. Nf3 e6 3. c4 Nf6 4. Nc3 Be7 5. Bf4 O-O 6. e3 b6 7. Rc1 Nh5 8.
Bg3 Bb7 9. Bd3 dxc4 10. Bxc4 Nxg3 11. hxg3 Nd7 12. Bd3 Nf6 13. Qc2 h6 14.
O-O a6 15. Qe2 Re8 16. Ne5 Bf8 17. Rfd1 g6 18. g4 Qe7 19. Qc2 Bg7 20. Ne4
Nd5 21. Nc6 Qf8 22. Qa4 Rec8 23. Qb3 Ne7 24. Ne5 Qd8 25. Nf3 Nd5 26. Rd2
Rab8 27. Rdc2 Qe7 28. Rc4 a5 29. a3 c5 30. Qd1 Rd8 31. Ng3 Nf6 32. dxc5
Bxf3 33. gxf3 bxc5 34. Qe2 Ne8 35. R1c2 Rxb2 36. Rxb2 Bxb2 37. Qxb2 Rxd3
38. a4 Qd7 39. Qb8 f5 40. Rxc5 Rd1+ 41. Kg2 fxg4 42. fxg4 Qxa4 43. Qa8 Rd3
44. Rxa5 Qd7 45. Ne4 Qd8 46. Ra6 Qxa8 47. Rxa8 Kf7 48. Ra7+ Kg8 49. Ra6 Ng7
50. g5 h5 51. Nf6+ Kf7 52. Ra7+ Kf8 53. Nd7+ Rxd7 54. Rxd7 Nf5 55. Kf3 Ke8
56. Rh7 Kf8 57. Ke4 Kg8 58. Rd7 h4 59. Ke5 h3 60. Kxe6 h2 61. Rd1 Kg7 62.
Rh1 Nh4 63. Rxh2 Nf3 64. Rg2 Ne1 65. Rg4 Nf3 66. Kd6 Ne1 67. e4 Nd3 68. e5
Nxf2 69. Rb4 Nh3 70. e6 Nxg5 71. e7 Nf7+ 72. Kd5 g5 73. e8=Q Kf6 74. Qe6+
Kg7 75. Rb7 g4 76. Rxf7+
{Black resigns} 1-0
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